Question edited for clarity and spelling of maker.
Question moved from TX Watches category.
Try the thermal reset again. When you are using the vacuum and then turn it off, the motor is hot and there is no cooling airflow. If the vacuum is close to cutting out through overheating that lack of air will trip it. If you have digital multimeter, you can check the thermal switch for continuity.
https://www.google.com/search?q=Riccar+1800+won%27t+turn+on
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